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up, yet studies like this one in europe show too much marijuana affects coordination and judgment. >> one of the first and most important being an inability or reduced ability to divide one's attention. >> reporter: marijuana advocates say pot is far less debilitating than alcohol, yet a canadian study says those who drive within three hours of smoking pot are twice as likely to cause a crash. >> another effect of individuals who drive under the influence of marijuana say reduced ability to perceive time and distance. >> reporter: how much is too much. >> i know for a fact we're nun chartered territory. >> reporter: 12 states -- in unchartered territory. >> reporter: 12 states have a zero tolerance for pot. 5-nanograms per blood level is the statute in some states. >> similar to how the dui standards have evolved over the years, it's not sure if this standard will change. >> reporter: the problem is heavy users though not impaired can test positive weeks after smoking. also what and how you smoke it affects people differently. so even experts don't know how much pot causes im
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